The infrared OH- absorptions in Bridgman grown Sr0.61Ba0.39Nb2O6 crystals have been investigated by Fourier transform infrared spectroscopy. Crystals exhibited typical O-H stretching vibrations near ν= 3500 cm-1 (λ≈2.87 μm). The polarization dependent absorption measurements revealed that a greater density of O-H bonds are polarized in the a-b plane with a smaller amount of bonds along the c axis. Protons (H+), which prefer a specific site at room temperature, tended to occupy different sites as the temperature increased. As-grown crystals contained protons on the order of 1017 cm-3, and the proton concentration increased by approximately 1 order of magnitude after heat treatment in a humid atmosphere.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)